ABS 2000 1150 gs fault light reset

[Davesbmw]

Before I tear into the bike I thought I would ask if anyone has has similar problems with their ABS on a 2000 1150 gs

I have had the ABS lights on the dash blinking top then bottom not both as they should when starting the engine on several occasions
Most of the time if I shut the ignition switch off and restart the two lights flash at the same time and the ABS module resets as I start to drive away from a stop.
However as of late the ABS shows a fault and does not reset even after going through the turn off and restart process, not such a big deal I just do not have ABS braking when this occurs but have the light flashing at me until I push the ABS button again.
Could this be something as simple as a bad connection on the wiring harness?
The bike has only 19,000 miles on it and yes I changed the brake lines from the rubber ones and bled the brakes and ABS module several times
Thanks for you help in advance
Dave

 

[gsaddict]

Find someone with a GS911 in your area and scan the ABS for faults.
It will have logged the issue.

Make sure the battery is good condition as well.
Have you had the wheels off recently? Is the sensor gap correct?

 

[kioolt]

My ABS light code chart shows that alternating flashing lights could be low fluid level.

 

[Davesbmw]

Abs

Find someone with a GS911 in your area and scan the ABS for faults.
It will have logged the issue.

Make sure the battery is good condition as well.
Have you had the wheels off recently? Is the sensor gap correct?

GS 911 showed a warning lamp fault Cleared it
no other faults or codes
Will remove the tank and check the wiring connections to the module next
thanks
Dave

 

[Davesbmw]

Find someone with a GS911 in your area and scan the ABS for faults.
It will have logged the issue.

Make sure the battery is good condition as well.
Have you had the wheels off recently? Is the sensor gap correct?

New battery this spring checks ok
don't know what the space at wheel sensor should be but looks normal
I do not have an issue while riding only at starting engine is when the abs lights show not ok
Gs 911 showed a abs warning lamp fault cleared and stayed clear
I will pull the tank and look at harness connections
Thanks
Dave

 

[kioolt]

The GS911 fault "Warning lamp Fault" could mean the actual lamp has a fault. Did you change to LED lights in the dash? One of the two lamps hooks directly to the controller board while the other one is operated through a relay. I would think that the one that hooks up directly to the controller board would be the one that would throw this fault. I would think that the other lamp would throw an ABS relay fault.

 

[Davesbmw]

Here is what I found

I pulled the tank removed the wiring harness to the ABS module and found no corrosion or moisture
used a electrical cleaner and replace it .
While in there
I removed and cleaned all wiring connectors I could find and reinstalled the Battery
When I turn on the key the two ABS lights on the instrument panel both flash as they should during their check mode
I pushed the bike to about three MPH and the abs module goes thru the diagnostic check, you hear the ABS module turn on and reset lights that are flashing go out and the ABS is set.
no warning lights all is good
However when I put the tank back I turn on the key and both lights flash at the same time as it should.When I start the engine the abs lights start modulating showing a fault and when you drive off the ABS does not run it diagnostic as it should.
If I turn the key on and push the bike the ABS clears as it should. Even tried pushing it to clear the ABS then started the engine and it goes into fault mode ie the warning lights blink on an off alternating from top to bottom.
What would cause this?

The GS911 shows no fault codes?????
Thanks for your help
Dave
All brake fluid levels ok and the sensor gaps are as they should be

If you turn the ignition on and do not start the engine the push the bike and the ABS resets and the lights clear you can coast down hill on gravel and the ABS brakes work as they should both front and rear piston actuate and prevent the wheels from locking up.
only if you start the engine does it go into fault mode and no ABS???

 

[rxcrider]

Sounds like low voltage at startup - I think - this has the early (non-servo / non-whizzy) ABS, right? Mine will do this on a cold morning or if I haven't ridden or had it on a charger for a while. I usually just ride for 5 or 10 minutes, then shut it off and restart it at a stop sign or light to reset it. With the battery charged up a bit and the engine warm, it cranks over quickly without a voltage drop and the ABS initiates without an error.


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[Davesbmw]

Sounds like low voltage at startup - I think - this has the early (non-servo / non-whizzy) ABS, right? Mine will do this on a cold morning or if I haven't ridden or had it on a charger for a while. I usually just ride for 5 or 10 minutes, then shut it off and restart it at a stop sign or light to reset it. With the battery charged up a bit and the engine warm, it cranks over quickly without a voltage drop and the ABS initiates without an error.


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Thanks
I will give that a try although I have ridden it for 30 minutes and tried shut it off and reset it with no luck
I will pickup a new battery or have mine tested also

 

[lee]

I will pickup a new battery or have mine tested also

Since your battery is less than 1 year old I would load test it before buying a new one.

 

[rxcrider]

Since your battery is less than 1 year old I would load test it before buying a new one.

I'll second that - I only saw your post just above mine when I responded - must have missed a page or something. Might be good to check voltage while cranking too. Out of curiosity, what battery did you install?


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[cele0001]

I think you pretty much figured it out yourself. By the way kudos for thorough troubleshooting.
The only other test to prove under voltage condition during starting would be to put nice big battery in parallel with yours and see if everything is fine.
Or, it could be poor connection at the battery or somewhere in the starting system that causes too large of a current draw and thereby under voltage. Check big wires.. (-1 for starting a sentence with "or" but +2 for working in "thereby" )
That is what I would do.

 

[gsaddict]

I pulled the tank removed the wiring harness to the ABS module and found no corrosion or moisture
used a electrical cleaner and replace it .
While in there
I removed and cleaned all wiring connectors I could find and reinstalled the Battery
When I turn on the key the two ABS lights on the instrument panel both flash as they should during their check mode
I pushed the bike to about three MPH and the abs module goes thru the diagnostic check, you hear the ABS module turn on and reset lights that are flashing go out and the ABS is set.
no warning lights all is good
However when I put the tank back I turn on the key and both lights flash at the same time as it should.When I start the engine the abs lights start modulating showing a fault and when you drive off the ABS does not run it diagnostic as it should.
If I turn the key on and push the bike the ABS clears as it should. Even tried pushing it to clear the ABS then started the engine and it goes into fault mode ie the warning lights blink on an off alternating from top to bottom.
What would cause this?

The GS911 shows no fault codes?????
Thanks for your help
Dave
All brake fluid levels ok and the sensor gaps are as they should be

If you turn the ignition on and do not start the engine the push the bike and the ABS resets and the lights clear you can coast down hill on gravel and the ABS brakes work as they should both front and rear piston actuate and prevent the wheels from locking up.
only if you start the engine does it go into fault mode and no ABS???

Low voltage will do this.
Can be caused by a poor battery or by a starter drawing to much current.
The starter may need a service.

 

[Davesbmw]

What is the link between starting and the ABS

Low voltage will do this.
Can be caused by a poor battery or by a starter drawing to much current.
The starter may need a service.

I do not doubt that this is the problem and will chase it down later today.
What I would like to understand is how the voltage drop while starting causes the ABS to go into Fault mode or whatever you call it?


This Forum is amazing as to the amount of cumulative knowledge members are willing to share with others.
Thanks again
Dave

 

[gsaddict]

What I would like to understand is how the voltage drop while starting causes the ABS to go into Fault mode or whatever you call it?

The voltage drops too low for internal electronics - a problem common enough that some 1100's very rewired so the ABS would not energize until the alternator was charging.
There are threads out there on how to do this mod.

Verify the battery and starter for correct function prior to considering.

 

[Davesbmw]

Replacing battery

The voltage drops too low for internal electronics - a problem common enough that some 1100's very rewired so the ABS would not energize until the alternator was charging.
There are threads out there on how to do this mod.

Verify the battery and starter for correct function prior to considering.

Looking at battery options have determined the almost new battery is the problem.
My question is do you or anyone know of another battery that is shorter than the stock one yet large enough to do the job.?
I have never liked how close the terminals are to the tank.

 

[pauls1150]

The tank, and all of the bodywork around it, is plastic, so there's no worries about shorting to anything.

 

[gsaddict]

The tank, and all of the bodywork around it, is plastic, so there's no worries about shorting to anything.

It's a GS - metal tank

 

[gsaddict]

Looking at battery options have determined the almost new battery is the problem.
My question is do you or anyone know of another battery that is shorter than the stock one yet large enough to do the job.?
I have never liked how close the terminals are to the tank.

Just cut a piece of rubber as shown below (Osyssey PC680 battery shown)

 

[Davesbmw]

Got that

Just cut a piece of rubber as shown below (Osyssey PC680 battery shown)

Thanks
I use one of those also.
I was doing some research on lithium batteries what is the consensus on them???
They weigh only 4 lbs as opposed to 15 to 18 lbs more cold cranking amps what is not to like about them?
This is not something I have considered until now.
Please comment on the +& -
Thanks